On Nov 17, 2012, at 1:16 AM, sajuptpm wrote:
> H, Michael Bayer
> Thanks
>
> You are correct, the rollback in method1 rollbacking transaction in
> main_method.
> I want to isolate transaction in main_method from rollback in method1.
>
> I attached more code.
>
>
> from sqlalchemy.orm import scoped_session, sessionmaker
> maker = sessionmaker(autoflush=True, autocommit=False,expire_on_commit=False,
> extension=ZopeTransactionExtension())
> zopelessmaker = sessionmaker(autoflush=True, \
> autocommit=False, \
> expire_on_commit=False)
> DBSession = scoped_session(maker)
>
>
>
> def main_method():
> db_obj1 = DBModelclass1("Hello")
> DBSession.add(db_obj1)
> DBSession.fush()
>
> for x in lst:
> try:
> method1(db_obj1.id)
> excpt Exception, ex:
> pass
>
>
>
> def method1(id):
> try:
>
> s1 = DBSession()
> s1.begin_nested()
> db_obj2 = DBModelclass2("Test")
> db_obj2.refname = "name_%s" %(id)
> DBSession.add(db_obj2)
> DBSession.fush()
>
> if some-codition:
> raise Exception("Failedd")
>
> s1.commit()
> except Exception, ex:
> s1.rollback()
> raise ex
other than the typos, as well as the multiple calls to "method1()" for every
"x" in a list where the "x" is apparently ignored, there is nothing obviously
wrong with this code. If you're using begin_nested(), it has to be on a
platform that supports SAVEPOINT. Currently Postgresql and MySQL with InnoDB
are the two main platforms supported.
As I have already stated in my previous email, turning on echo=True and/or
echo='debug' will illustrate the SQL being emitted as well as where
transactions start and end. This is a *critical* step to being able to
understand your issue. I'd also recommend using pdb so that you can step into
the code and examine the state of the database and program state one line at a
time.
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